/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.facebook.presto.tracing;

import com.facebook.presto.spi.tracing.NoopTracer;
import com.facebook.presto.spi.tracing.Tracer;
import com.facebook.presto.spi.tracing.TracerHandle;
import com.facebook.presto.spi.tracing.TracerProvider;
import com.google.inject.Inject;

import java.util.Map;
import java.util.function.Function;

public class NoopTracerProvider
        implements TracerProvider
{
    public static final NoopTracerProvider NOOP_TRACER_PROVIDER = new NoopTracerProvider();
    public static final NoopTracer NOOP_TRACER = new NoopTracer();
    public static final TracerHandle NOOP_TRACER_HANDLE = new NoopTracerHandle();
    public static final Function<Map<String, String>, TracerHandle> NOOP_HANDLE_GENERATOR = headers -> NOOP_TRACER_HANDLE;

    @Inject
    public NoopTracerProvider() {}

    @Override
    public String getName()
    {
        return "NOOP tracer provider";
    }

    @Override
    public String getTracerType()
    {
        return TracingConfig.TracerType.NOOP;
    }

    @Override
    public Function<Map<String, String>, TracerHandle> getHandleGenerator()
    {
        return NOOP_HANDLE_GENERATOR;
    }

    @Override
    public Tracer getNewTracer(TracerHandle handle)
    {
        return NOOP_TRACER;
    }
}
